Ruby River: Almandine Garnet Rockhounding in Madison County, Montana

Public accessBest spot1 mineralMadison County, MontanaUpdated June 2026

Mineral reported: 1
Elevation: 5,270 ft
Best months: March to October

Ruby River is Montana's clearest garnet-focused pick in this candidate set, with nearby Mindat records listing almandine and broader Madison County garnet occurrences. Its appeal is narrow but strong: a recognizable metamorphic and placer-derived garnet target in a state otherwise dominated in popular collecting by sapphire and agate. Reported finds include almandine garnet. Below: coordinates, access notes, nearby spots, and trip-planning links.

Plan your visit

Generally open to casual rockhounding

County: Madison County
State: Montana
Nearest road: Upper Ruby Road
Coordinates: 45.26145, -112.09957

Get directions View on Google Maps

Coordinates are approximate. Confirm the exact ground in the RockHoundR app, where land overlays show which agency manages the area.

Land & collecting status

Generally open to casual rockhounding

Most public-tagged spots sit on BLM, U.S. Forest Service, or other federal land where reasonable hand collecting of common rocks and minerals is allowed. Confirm posted rules and active mining claims before you dig.

Access note: Use lawful public stream access only and avoid private ranchland, active placer claims, and closed riparian areas.

Public-land rules vary by agency, season, and field office. The RockHoundR app pulls live BLM, USFS, NPS, and tribal overlays so you can see exactly which agency manages the ground at this spot.

Best time to visit Ruby River

34°J

36°F

45°M

52°A

62°M

70°J

80°J

79°A

69°S

55°O

41°N

32°D

Comfortable months (45 to 90°F highs)

Best months: March to October. Typical highs run 80°F in midsummer and 34°F in midwinter, with winter lows near 15°F.

Climate normals: NOAA 1991-2020 monthlies, LAURIN 2NE station (7 mi away).

Geology at Ruby River

This spot sits on Alluvial deposits, mapped as sand and gravel that formed within roughly the last 3 million years. Loose deposits like these are float-collecting ground: erosion keeps moving durable rocks and minerals into gravel bars, cutbanks, and washes.

Mapped unit: Alluvial deposits
Age: 3 Ma to present (Pleistocene to Holocene)
Rock types: sand and gravel
Elevation: 5,270 ft

Geologic mapping via Macrostrat and the underlying state geological survey maps (CC BY 4.0). Bedrock at the surface can vary within a mapped unit.

Today's weather

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Sources & verification

Spot details combine the public RockHoundR location dataset, normalized mineral labels, agency land-status checks in the app, and community submissions. Coordinates are approximate until verified in the field.

State guidance last verified: April 1, 2026

BLM Montana, Recreational mineral collecting
Montana Bureau of Mines and Geology
Gem Mountain Sapphire Mine (fee-dig operator)
Community submissions reviewed against published agency rules

Found at Ruby River

Each name opens all spots that produce that material; the encyclopedia link opens the full ID and field guide.

Almandine Garnet Encyclopedia →

Nearby rockhounding spots

Other rockhounding spots within driving distance of Ruby River.

Ruby DamMadison County, Montana · 2 mi awayGarnet
Red Rock Mine & Garnet GalleryMadison County, Montana · 5 mi awayGarnet
Virginia CityMadison County, Montana · 7 mi awayGarnet, Gold
EnnisMadison County, Montana · 9 mi awayAndalusite, Kyanite, Sillimanite
Gem MountainMadison County, Montana · 14 mi awaySapphire
Indian Creek RoadMadison County, Montana · 16 mi awayCalcite
Gravelly RangeMadison County, Montana · 17 mi awayOnyx
Bismark MineMadison County, Montana · 24 mi awayMolybdenite, Pyrite, Chalcopyrite

Across the state line from Ruby River

Ruby River is close enough to the Montana border that the next-closest rockhounding spots are in a neighboring state. Worth knowing if you are already on the road.

Spencer Opal MineClark County, Idaho · 62 mi awayFire Opal
Crystal ButteFremont County, Idaho · 70 mi awayAndesine

Ruby River FAQ

Where is Ruby River?+

Ruby River is in Madison County, Montana, at 45.26145, -112.09957. Nearest road: Upper Ruby Road.

What rocks and minerals can you find at Ruby River?+

Ruby River is reported to produce Almandine Garnet.

Is collecting allowed at Ruby River?+

Generally open to casual rockhounding. Most public-tagged spots sit on BLM, U.S. Forest Service, or other federal land where reasonable hand collecting of common rocks and minerals is allowed. Confirm posted rules and active mining claims before you dig. Always confirm current rules with the managing agency before a trip.

What tools should I bring to Ruby River?+

A rock hammer, a sieve, and a small shovel work well for garnet-type minerals, which concentrate as resistant grains in soils and creek gravels.

When is the best time to visit Ruby River?+

The most comfortable months at Ruby River are March to October.

How do I get to Ruby River?+

Open the directions link to navigate to 45.26145, -112.09957 in Google Maps. The nearest road is Upper Ruby Road.